Our People

Our Management

Technical Team

Technical Associate

Bowo Kusnanto brings more than 25 years of expertise to the resources sector, highlighted by a distinguished 15-year tenure in exploration management roles within renowned entities listed on the ASX and BEI, including Freeport Mc Moran, Zinifex, Perilya, Oxiana/MMG, Tiger Realm Minerals, J Resources, and Asiamet Resources. Holding a Bachelor's degree in Geology from UPN, Kusnanto has excelled in steering projects at various stages—from greenfield explorations to fully operational mines—both in Indonesia and internationally. His journey has not only encompassed significant achievements in the exploration and reporting of gold and copper but also extended to include substantial experience with nickel and bauxite exploration in Indonesia. His technical expertise and leadership have consistently yielded impactful results, solidifying his status as a recognized competent person in the exploration and reporting of these minerals.

Bowo Kusnanto

Gyaista Sampurno boasts an impressive career spanning over 25 years in the resources sector, with a significant tenure of 5 years as Chief and Principal Geologist at J Resources. A graduate of ITB in 1996, Sampurno has excelled in field-oriented and technologically adept exploration roles. His expertise is particularly notable in greenfield and brownfield explorations for Low Sulphidation Epithermal (LSE), High Sulphidation Epithermal (HSE), Porphyry, and Iron Oxide Copper Gold (IOCG) deposit types, primarily with Newmont and J Resources Nusantara. Sampurno's international experience further underscores his comprehensive understanding and capability in the geology field.

Gyaista Sampurno

Nur Tri Atmaji has over 20 years of experience in building and leading finance teams in large companies with significant operational scale and complexity. Previously, he held various positions at PT Petrosea Tbk, including GM Financial Controller, Statutory Reporting Manager, Senior Cost Control, Account Payable Superintendent, Senior Project Accountant, and Asset Accountant.
He oversees accounting, business support, financial planning and analysis, treasury, M&A, audit, and tax functions. He earned his Bachelor of Accountancy from Diponegoro University and a Master of Management in Finance from Pelita Harapan University.

Nur Tri Atmaji

David Iswanto is a field-oriented with rounded experience Geologist in Generative and Greenfields to Brownfields detailed Exploration work equipped with strong understanding of various gold, copper and base-metal deposit including Porphyry, High Sulphidation Epithermal, Intermediate Sulphidation Epithermal, Low Sulphidation Epithermal, Sediment Hosted, Skarn, Orogenic, mostly for gold, copper and other base-metal deposits. He has significant track record as part of Discovery Team at several prospects and significant contribution on incremental resources in several operation Gold Mines in Indonesia.

David Iswanto

Arief is a strong field-oriented senior geologist with 12 years of experience in mastering geological understanding, conceptualizing and executing exploration for complex deposits within greenfield, brownfield and advanced exploration programs. He is a part of the successful technical team at Pani Project, Doup, Bolangitang and the generative exploration program in J Resources.

Arief Eko Prihandoyo

Ahmad is a strong field-oriented senior exploration geologist with 12 year-round experience in exploration with strength in QAQC, generative exploration and technical due diligence for multi-commodity mostly for Nickel laterite, Bauxite and Coal.

Ahmad Hidayat

Muhammad Riefaldy is a geologist with approximately 10 years of experience in the mineral industry, skilled in working with High Sulphidation Epithermal, Low Sulphidation Epithermal, Orogenic Gold, Porphyry, and Intrusion-Related Gold Deposits. Proficient in data analysis, field investigation, database management, geological resource modelling, grade control system, operation and project budgeting, covering all stages from exploration and geometallurgy to grade control and mine closure evaluation. Experienced in using Micromine for 3D geological interpretation, modelling, and generating block models.

Muhammad Riefaldy

Febby is a geologist with over 10 years of experience in project, mine, and exploration geology at J Resources Nusantara and PT Geo Fix Indonesia.
Febby has directed geometallurgical studies to address low extraction issues and developed extraction and comminution models. Proficient in geological mapping, sampling theory, geometallurgical analysis, 3D modelling,  and block modelling. 
He is experienced in using Micromine, Leapfrog, and ioGAS software. 
His achievements include reducing operational risks, promoting a zero-harm culture, increasing mineral resources by 23% through breccia classification, and resolving high Cu and sulfur content issues.

Febby Yudhi Pratama, M.Eng.

Fakhri Auladana (Abil) is Indonesian Geologist who have interest in exploration with strong background over 7 years experience in Generative, Greenfields and Brownfields Exploration. Being part of discovery and development team in several deposits including Porphyry, High Sulfidation and Vein Systems deposits. Moreover, has strong key skills such as field-oriented and data-oriented in understanding geological concept, geology modelling, project planning, exploration target delineation, reporting and databases.

Muhammad Fakhri Auladana

Adi is skilled at combining science and technology in mineral exploration, especially for copper and gold deposits. He has worked on major projects at renowned sites like Grasberg in Indonesia and Ikutahara in Japan, as well as in Thailand, Sumatra, Java, Sulawesi, and Papua. 
He is experienced in advanced analytical techniques and has shared his research globally. Adi also authored the important article “Reduction of oxidized sulfur in the formation of the Grasberg porphyry copper-gold deposit,” introducing new exploration tools with wide potential use.

Adi Sulaksono, Ph.D.

Ufi Ma'rufianty is a experienced geologist-geostatistician with over 17 years of experience in resource estimation, i.e., nickel, iron ore, and bauxite laterite deposits. Holding a bachelor's degree in geological engineering from a renowned university in Indonesia and a postgraduate diploma in geostatistics from MINES ParisTech, Paris, Ufi is a certified Competent Person Indonesia (CPI) for nickel laterite resource estimation, working in accordance with international standards, e.g., KCMI, JORC, and NI 43-101. Hitherto, Ufi has led more than 20 lateritic deposits resource estimation, developing and optimizing mining block models, and ensuring data accuracy through strong QA/QC practices. Her early experience in exploration geology has provided for her a solid understanding in fieldwork, sampling, and geological mapping. Her reliability in managing multiple projects and delivering valid results punctually makes her a credible expert in the mining industry. Ufi is highly skilled in operating sophisticated industrial mining software, e.g., ISATIS, DATAMINE, and ArcGIS for geostatistical modeling and resource management.

Ufi Ma'rufianty

Kartika Dwi Handayani is an experienced senior coal geologist with more than 25 years experience covering various roles both technical and managerial in major national and multinational mining companies and mining services companies. Her experience includes detailed technical exploration work in greenfields, brownfields, resource estimation, mine operation, exploration project management and complex technical due diligence. She is resource geologist, member of AusIMM and is a competent person under JORC code for coal Resource estimation reporting and sign-off.

Kartika Dwi Handayani

Saut is a senior mine and resource geologist with experiencing from greenfield to brownfield geologist exploration and project development with extensive in mine geology and mineral resource experience over the past 24 years with a solid background in mineral resources, mine production and project development in a small and large Au-Ag epithermal low sulphidation and Au orogenic, Au high nugget narrow vein deposits, Cu-Au porphyry deposits, Cu-Zn base metal deposits, iron ore deposits. He is familiar with Mineral Resource Estimation (Linear and Non-Linear Estimation) for Underground and Open Pit mining using Vulcan, Isatis and Supervisor mining software including estimation evaluations/review and audits, desktop study and due diligence. He has strong international assignments and has worked with Newmont, Oxiana, SRK, Quantitative Group, Evolution Mining and MMG. He is a competent person; CP (Geo) AusIMM for Mineral Resource Technical reporting for annual mineral resource report to ASX (Australia Stock Exchange).

Saut Simbolon, M.Sc.

Tomy is a senior metallurgist with more than 16 years of experience in gold and nickel commodities.

Tomy Taladin, S.T., MBA (PMP)

Rachmat Pratiwinda is an exploration geologist with 30 years of experience in Cu-Au and Au systems across Indonesia, covering the full value chain from grassroots discovery to feasibility. He has a proven track record in major deposit discoveries, project generation, and technical due diligence for acquisitions. He served as a key leader in geothermal-mineral integration at the Onto Hu’u Daha Geothermal Project and is recognized as part of the discovery team of the Onto Cu-Au deposit (Hu’u Project), which was awarded the 2025 PDAC Thayer Lindsley Award for International Mineral Discovery of the Year. He is also registered as a Competent Person (Indonesia) for Exploration Reporting in Gold and Copper.